摘要
天然气偏差因子是天然气工程计算中一项相当重要的参数 ,该参数普遍采用相关经验公式计算。这些方法大体可分为两大类 :一类是依据最小二乘原理得到的方法 ,这类方法计算简便 ,但其结果的精度较低 ;另一类是依据状态方程得到的方法 ,目前已有四种方法 ,这类方法计算较为复杂 ,但其计算结果的精度较高。对于众多的计算方法 ,许多作者在等压线或等温线上提出了对方法精度的评价 ,使方法的有效适用范围难以确定。文章则在等压线和等温线构成的二维平面上考察各种应用状态方程计算Z因子方法的精度 ,旨在确定各种方法的有效适用范围 。
Gas deviation factor being a very important parameter in gas engineering calculation was calculated by use of empirical formulas in general. These methods may be roughly divided into two kinds: one is the methods drived from least square principle, which are simple and convenient to calculate but have relatively low accuracies in their calculation results and the other is the methods drived from state equation. There are four methods at present. It was relatively complicated to calculate by use of these methods, the accuracies, however, of the results calculated were relatively high. The accuracy evaluation results of various methods were proposed on isopressure lines of isothermal lines by many scholars, thus causing the effective applying scopes of the methods to be difficuly of determining. In the paper it is pointed out that various accuracies of the methods of calculating deviation factor (Z) by applying state equation can be examined on the 2-D horizontal plan made up by Isopressure lines and isothermal lines, so as to determine the effective applying scopes of various methods in the hope of their being well applied by the other scholars.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2003年第2期69-71,共3页
Natural Gas Industry
关键词
应用
状态方程
计算
天然气
偏离系数
精度
评价
Gas industry
Least squares approximations
Natural gas fields
Pressure effects
Thermal effects
